Project Development and Implementation Mine Water Treatment Strategies at Resolution Copper Mining and the Eagle Project Casey McKeon Resolution Copper Mining LLC ID: 810972
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Kennecott’s Eagle Development Project
Project Development and Implementation
Mine
Water Treatment Strategies at
Resolution Copper
Mining and the Eagle Project
Casey McKeon, Resolution Copper
Mining, LLC
Kristin Mariuzza, Eagle Development Project
Slide2OVERVIEW Project IntroductionsRegulations that govern project design
Water Treatment Design Water Management2 Presentation title April 3, 2012
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Confidential; © Copyright Protected
Resolution Copper Project Overview
Near Superior, ArizonaAdjacent to the Magma Mine (1911-1996)Rio Tinto and BHP partnership3rd largest undeveloped Cu resource in world1.62 billion tonnes @
1.47% Cu>$5 billion investment40-year mine lifeLocated in the Historic Pioneer Mining District
Slide4Resolution Copper Water TreatmentRequired for dewatering old Magma Mine workings adjacent to new work areas
Safety of shaft sinking-exploration activitiesHistoric Treatment (pre -1996)Onsite ponds AZPDES requirement onlyPresent DayOver 2.5 billion gallons to dewater (2008)New HDS treatment process: Lime (pH) and Soda Ash (prevent scaling) AZPDES and Aquifer Protection Permits (APP) for discharges and solids storage ponds
Treats to Aquifer Quality Limits and surface water standardsReverse Osmosis required for gypsum removal if discharging to nearby creek Looked for alternative, beneficial use of water 4 Presentation title April 3, 2012
Slide5Water Treatment ObjectivesDewater existing underground copper mine
Beneficially use the treated water in a cooperative effort
Slide6Goal: remove water from existing copper mine (2009)
RCM Copper Mine
RCM Pipeline
Beneficial Reuse Area
Slide7Project Cooperators Resolution Copper Mining, LLC (RCM)Supply water and support sampling efforts New Magma Irrigation and Drainage District (NMID)
Facilitate land access and communicate with RCM6 cooperating growers University of Arizona (UA) Provide laboratory services and quality control of data NewFields Agricultural & Environmental ResourcesCoordinate and conduct sampling and reporting efforts and facilitate grower communication
Slide85,200 acres; 68+ fields
Slide9Monitoring Approach
Sample TypeSampling Frequency
ContinuousMonthly
Quarterly
WaterGrab
XX
In Situ ProbeX
Soil0-12” & 12-24” sample depths
X*
Plant
Tissue
X*
Water probes measure pH, specific conductance and
temperature
Water grab samples measure salinity and nutrient related constituents monthly.
Soil samples measure salinity and nutrient levels quarterly and metals annually
.
Plant tissue samples measure salinity and nutrient levels quarterly, depending on crop growth cycles, and metals annually.
Slide10Water Quality Website
Slide11Web Mapping ApplicationAllows stakeholders to view Project data related to soil salinityView Project infrastructureView field informationAccess Project documentsChart trends for soil constituent
Facilitates rapid, visual representation of key constituents to ensure project goals concerning agricultural production are being metUsed frequently during grower meetings to spatially and temporally compare each growers dataIntended to be made available to each grower once login information is established
Slide12Web Mapping Application
Slide13Results: Soil Salinity 0-12”Crop productivity has not been impacted
Slide14Results: Dewatering, over 2B gallons to date
Slide15Communication with GrowersSemi-Annual meetings with growers prior to each sampling eventDiscuss field conditions and recent field
operations Ensure all farm staff are aware of our activitiesShare data
Slide16ResultsNutrient and metal levels for the water, soil and plant tissue samples have all fallen within acceptable, expected ranges.Environmental health and agricultural productivity have remained unaffected.
Soil salinities (gypsum) have increased slightly, as expected, but have not affected crop yield.
Slide17Lessons LearnedDaily communication is critical among all project stakeholders Conservative sampling and irrigation efforts throughout the project have been helpful for tracking salinity trendsConsistency in the water treatment and regular communications have led to
continued project success.
Slide18Kennecott’s Eagle Development Project
Project Development and Implementation
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Eagle
Michigan, USA
Located in the Upper Peninsula of Michigan
Marquette County
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3 April 2012
Presentation Title
20
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Source: Kennecott Eagle
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Mine Site Layout
North
underground ore body (6 acres)
ventilation raise and aggregate backfill site
surface facilities
underground decline to ore body
mine portal
site access road
surface road from portal to storage pad
Source: Kennecott Eagle
Salmon-Trout River
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Michigan’s Environmental RegulationsPart 31, Water Resources Protection, of PA 451, Natural Resources and Environmental Protection Act, of 1994.Part 22 Rules, Groundwater Quality
Part 4 Rules, Water Quality StandardsPart 8 Rules, Water Quality Based Effluent Limit Development3 April 2012
Regulatory Drivers
Part 632, Nonferrous Metallic Mining Regulations, of PA 451, Natural Resources and Environmental Protection Act, of 1994
.Covers all aspects of mining and includes EIA
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Michigan’s Environmental Regulations
3 April 2012
Regulatory Drivers
Part 632, Nonferrous Metallic Mining Regulations, of PA 451, Natural Resources and Environmental Protection Act, of 1994.
- Underground Dewatering
- Storm Water Runoff from Operations Area- Temporary Development Rock Storage Area Industrial Landfill Equivalency Leachate Collection Geomembrane Cover
Waters that Receive Treatment at WTF
Not Treated at WTF
- Sanitary Wastewater
- Non-Contact Storm Water
Managing Water On Site
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Michigan’s Environmental Regulations
3 April 2012
Regulatory Drivers
Part 31, Water Resources Protection, of PA 451, Natural Resources and Environmental Protection Act, of 1994.
Water
On Site Governed by:
- Part 22 Rules - Groundwater Quality Contact Water Basin Liner Design Basis of Design for Facility and Infiltration Gallery Water Discharge Application Requirements
- Part 4 Rules - Water Quality Standards
Antidegradation - Best Technology in Process in Treatment for BCC Mercury
- Part 8 Rules - Water Quality Based Effluent Limits
Low Level Metals – Designated Use Protection
Due to groundwater venting, the state agency applied surface water discharge requirements to the venting location (groundwater seeps).
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Final Agency Decisions
3 April 2012
Regulatory Drivers
Parameter
Eagle Permit Limit
Monthly Average(ug/l)Michigan Drinking Water Standard(ug/l)
Selenium5
50
Mercury
0.0021
2
Copper
10
1300
Ultimately, the State of Michigan issued a water discharge permit that included limits protective of both surface and ground water.
Compliance points are both groundwater and WTF effluent.
Comparison of select Permit Limits and Drinking Water Standards
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Water Treatment Facility Schematic
Facility rain/snow
Mine Inflow
Filtration
Groundwater Infiltration System
Metals Precipitation Process
Double Pass Reverse Osmosis
Recycle for Mine
350
gpm
permitted
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Questions are Welcome.
Thank You.